1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1983, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)tftpd.c 8.1 (Berkeley) 6/4/93";
41 #endif
42 #endif /* not lint */
43 #include <sys/cdefs.h>
44 /*
45 * Trivial file transfer protocol server.
46 *
47 * This version includes many modifications by Jim Guyton
48 * <guyton@rand-unix>.
49 */
50
51 #include <sys/param.h>
52 #include <sys/ioctl.h>
53 #include <sys/socket.h>
54 #include <sys/stat.h>
55 #include <sys/time.h>
56
57 #include <netinet/in.h>
58 #include <arpa/tftp.h>
59
60 #include <ctype.h>
61 #include <errno.h>
62 #include <fcntl.h>
63 #include <netdb.h>
64 #include <pwd.h>
65 #include <stdint.h>
66 #include <stdio.h>
67 #include <stdlib.h>
68 #include <string.h>
69 #include <syslog.h>
70 #include <time.h>
71 #include <unistd.h>
72
73 #include "tftp-file.h"
74 #include "tftp-io.h"
75 #include "tftp-utils.h"
76 #include "tftp-transfer.h"
77 #include "tftp-options.h"
78
79 #ifdef LIBWRAP
80 #include <tcpd.h>
81 #endif
82
83 static void tftp_wrq(int peer, char *, size_t);
84 static void tftp_rrq(int peer, char *, size_t);
85
86 /*
87 * Null-terminated directory prefix list for absolute pathname requests and
88 * search list for relative pathname requests.
89 *
90 * MAXDIRS should be at least as large as the number of arguments that
91 * inetd allows (currently 20).
92 */
93 #define MAXDIRS 20
94 static struct dirlist {
95 const char *name;
96 size_t len;
97 } dirs[MAXDIRS+1];
98 static int suppress_naks;
99 static int logging;
100 static int ipchroot;
101 static int check_woth = 1;
102 static int create_new = 0;
103 static const char *newfile_format = "%Y%m%d";
104 static int increase_name = 0;
105 static mode_t mask = S_IWGRP | S_IWOTH;
106
107 struct formats;
108 static void tftp_recvfile(int peer, const char *mode);
109 static void tftp_xmitfile(int peer, const char *mode);
110 static int validate_access(int peer, char **, int);
111 static char peername[NI_MAXHOST];
112
113 static FILE *file;
114
115 static struct formats {
116 const char *f_mode;
117 int f_convert;
118 } formats[] = {
119 { "netascii", 1 },
120 { "octet", 0 },
121 { NULL, 0 }
122 };
123
124 int
main(int argc,char * argv[])125 main(int argc, char *argv[])
126 {
127 struct tftphdr *tp;
128 int peer;
129 socklen_t peerlen, len;
130 ssize_t n;
131 int ch;
132 char *chroot_dir = NULL;
133 struct passwd *nobody;
134 const char *chuser = "nobody";
135 char recvbuffer[MAXPKTSIZE];
136 int allow_ro = 1, allow_wo = 1, on = 1;
137 pid_t pid;
138
139 tzset(); /* syslog in localtime */
140 acting_as_client = 0;
141
142 tftp_openlog("tftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
143 while ((ch = getopt(argc, argv, "cCd::F:lnoOp:s:Su:U:wW")) != -1) {
144 switch (ch) {
145 case 'c':
146 ipchroot = 1;
147 break;
148 case 'C':
149 ipchroot = 2;
150 break;
151 case 'd':
152 if (optarg == NULL)
153 debug++;
154 else if (atoi(optarg) != 0)
155 debug += atoi(optarg);
156 else
157 debug |= debug_finds(optarg);
158 break;
159 case 'F':
160 newfile_format = optarg;
161 break;
162 case 'l':
163 logging = 1;
164 break;
165 case 'n':
166 suppress_naks = 1;
167 break;
168 case 'o':
169 options_rfc_enabled = 0;
170 break;
171 case 'O':
172 options_extra_enabled = 0;
173 break;
174 case 'p':
175 packetdroppercentage = (unsigned int)atoi(optarg);
176 tftp_log(LOG_INFO,
177 "Randomly dropping %d out of 100 packets",
178 packetdroppercentage);
179 break;
180 case 's':
181 chroot_dir = optarg;
182 break;
183 case 'S':
184 check_woth = -1;
185 break;
186 case 'u':
187 chuser = optarg;
188 break;
189 case 'U':
190 mask = strtol(optarg, NULL, 0);
191 break;
192 case 'w':
193 create_new = 1;
194 break;
195 case 'W':
196 create_new = 1;
197 increase_name = 1;
198 break;
199 default:
200 tftp_log(LOG_WARNING,
201 "ignoring unknown option -%c", ch);
202 }
203 }
204 if (optind < argc) {
205 struct dirlist *dirp;
206
207 /* Get list of directory prefixes. Skip relative pathnames. */
208 for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
209 optind++) {
210 if (argv[optind][0] == '/') {
211 dirp->name = argv[optind];
212 dirp->len = strlen(dirp->name);
213 dirp++;
214 }
215 }
216 }
217 else if (chroot_dir) {
218 dirs->name = "/";
219 dirs->len = 1;
220 }
221 if (ipchroot > 0 && chroot_dir == NULL) {
222 tftp_log(LOG_ERR, "-c requires -s");
223 exit(1);
224 }
225
226 umask(mask);
227
228 if (ioctl(0, FIONBIO, &on) < 0) {
229 tftp_log(LOG_ERR, "ioctl(FIONBIO): %s", strerror(errno));
230 exit(1);
231 }
232
233 /* Find out who we are talking to and what we are going to do */
234 peerlen = sizeof(peer_sock);
235 n = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
236 (struct sockaddr *)&peer_sock, &peerlen);
237 if (n < 0) {
238 tftp_log(LOG_ERR, "recvfrom: %s", strerror(errno));
239 exit(1);
240 }
241 getnameinfo((struct sockaddr *)&peer_sock, peer_sock.ss_len,
242 peername, sizeof(peername), NULL, 0, NI_NUMERICHOST);
243 if ((size_t)n < 4 /* tftphdr */) {
244 tftp_log(LOG_ERR, "Rejecting %zd-byte request from %s",
245 n, peername);
246 exit(1);
247 }
248
249 /*
250 * Now that we have read the message out of the UDP
251 * socket, we fork and exit. Thus, inetd will go back
252 * to listening to the tftp port, and the next request
253 * to come in will start up a new instance of tftpd.
254 *
255 * We do this so that inetd can run tftpd in "wait" mode.
256 * The problem with tftpd running in "nowait" mode is that
257 * inetd may get one or more successful "selects" on the
258 * tftp port before we do our receive, so more than one
259 * instance of tftpd may be started up. Worse, if tftpd
260 * break before doing the above "recvfrom", inetd would
261 * spawn endless instances, clogging the system.
262 */
263 pid = fork();
264 if (pid < 0) {
265 tftp_log(LOG_ERR, "fork: %s", strerror(errno));
266 exit(1);
267 } else if (pid != 0) {
268 exit(0);
269 }
270 /* child */
271
272 #ifdef LIBWRAP
273 /*
274 * See if the client is allowed to talk to me.
275 * (This needs to be done before the chroot())
276 */
277 {
278 struct request_info req;
279
280 request_init(&req, RQ_CLIENT_ADDR, peername, 0);
281 request_set(&req, RQ_DAEMON, "tftpd", 0);
282
283 if (hosts_access(&req) == 0) {
284 if (debug & DEBUG_ACCESS)
285 tftp_log(LOG_WARNING,
286 "Access denied by 'tftpd' entry "
287 "in /etc/hosts.allow");
288
289 /*
290 * Full access might be disabled, but maybe the
291 * client is allowed to do read-only access.
292 */
293 request_set(&req, RQ_DAEMON, "tftpd-ro", 0);
294 allow_ro = hosts_access(&req);
295
296 request_set(&req, RQ_DAEMON, "tftpd-wo", 0);
297 allow_wo = hosts_access(&req);
298
299 if (allow_ro == 0 && allow_wo == 0) {
300 tftp_log(LOG_WARNING,
301 "Unauthorized access from %s", peername);
302 exit(1);
303 }
304
305 if (debug & DEBUG_ACCESS) {
306 if (allow_ro)
307 tftp_log(LOG_WARNING,
308 "But allowed readonly access "
309 "via 'tftpd-ro' entry");
310 if (allow_wo)
311 tftp_log(LOG_WARNING,
312 "But allowed writeonly access "
313 "via 'tftpd-wo' entry");
314 }
315 } else
316 if (debug & DEBUG_ACCESS)
317 tftp_log(LOG_WARNING,
318 "Full access allowed"
319 "in /etc/hosts.allow");
320 }
321 #endif
322
323 /*
324 * Since we exit here, we should do that only after the above
325 * recvfrom to keep inetd from constantly forking should there
326 * be a problem. See the above comment about system clogging.
327 */
328 if (chroot_dir) {
329 if (ipchroot > 0) {
330 char *tempchroot;
331 struct stat sb;
332 int statret;
333 struct sockaddr_storage ss;
334 char hbuf[NI_MAXHOST];
335
336 statret = -1;
337 memcpy(&ss, &peer_sock, peer_sock.ss_len);
338 unmappedaddr((struct sockaddr_in6 *)&ss);
339 getnameinfo((struct sockaddr *)&ss, ss.ss_len,
340 hbuf, sizeof(hbuf), NULL, 0,
341 NI_NUMERICHOST);
342 asprintf(&tempchroot, "%s/%s", chroot_dir, hbuf);
343 if (ipchroot == 2)
344 statret = stat(tempchroot, &sb);
345 if (ipchroot == 1 ||
346 (statret == 0 && (sb.st_mode & S_IFDIR)))
347 chroot_dir = tempchroot;
348 }
349 /* Must get this before chroot because /etc might go away */
350 if ((nobody = getpwnam(chuser)) == NULL) {
351 tftp_log(LOG_ERR, "%s: no such user", chuser);
352 exit(1);
353 }
354 if (chroot(chroot_dir)) {
355 tftp_log(LOG_ERR, "chroot: %s: %s",
356 chroot_dir, strerror(errno));
357 exit(1);
358 }
359 if (chdir("/") != 0) {
360 tftp_log(LOG_ERR, "chdir: %s", strerror(errno));
361 exit(1);
362 }
363 if (setgroups(1, &nobody->pw_gid) != 0) {
364 tftp_log(LOG_ERR, "setgroups failed");
365 exit(1);
366 }
367 if (setuid(nobody->pw_uid) != 0) {
368 tftp_log(LOG_ERR, "setuid failed");
369 exit(1);
370 }
371 if (check_woth == -1)
372 check_woth = 0;
373 }
374 if (check_woth == -1)
375 check_woth = 1;
376
377 len = sizeof(me_sock);
378 if (getsockname(0, (struct sockaddr *)&me_sock, &len) == 0) {
379 switch (me_sock.ss_family) {
380 case AF_INET:
381 ((struct sockaddr_in *)&me_sock)->sin_port = 0;
382 break;
383 case AF_INET6:
384 ((struct sockaddr_in6 *)&me_sock)->sin6_port = 0;
385 break;
386 default:
387 /* unsupported */
388 break;
389 }
390 } else {
391 memset(&me_sock, 0, sizeof(me_sock));
392 me_sock.ss_family = peer_sock.ss_family;
393 me_sock.ss_len = peer_sock.ss_len;
394 }
395 close(STDIN_FILENO);
396 close(STDOUT_FILENO);
397 close(STDERR_FILENO);
398 peer = socket(peer_sock.ss_family, SOCK_DGRAM, 0);
399 if (peer < 0) {
400 tftp_log(LOG_ERR, "socket: %s", strerror(errno));
401 exit(1);
402 }
403 if (bind(peer, (struct sockaddr *)&me_sock, me_sock.ss_len) < 0) {
404 tftp_log(LOG_ERR, "bind: %s", strerror(errno));
405 exit(1);
406 }
407
408 tp = (struct tftphdr *)recvbuffer;
409 tp->th_opcode = ntohs(tp->th_opcode);
410 if (tp->th_opcode == RRQ) {
411 if (allow_ro)
412 tftp_rrq(peer, tp->th_stuff, (size_t)n - 1);
413 else {
414 tftp_log(LOG_WARNING,
415 "%s read access denied", peername);
416 exit(1);
417 }
418 } else if (tp->th_opcode == WRQ) {
419 if (allow_wo)
420 tftp_wrq(peer, tp->th_stuff, (size_t)n - 1);
421 else {
422 tftp_log(LOG_WARNING,
423 "%s write access denied", peername);
424 exit(1);
425 }
426 } else
427 send_error(peer, EBADOP);
428 exit(1);
429 }
430
431 static void
reduce_path(char * fn)432 reduce_path(char *fn)
433 {
434 char *slash, *ptr;
435
436 /* Reduce all "/+./" to "/" (just in case we've got "/./../" later */
437 while ((slash = strstr(fn, "/./")) != NULL) {
438 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
439 ;
440 slash += 2;
441 while (*slash)
442 *++ptr = *++slash;
443 }
444
445 /* Now reduce all "/something/+../" to "/" */
446 while ((slash = strstr(fn, "/../")) != NULL) {
447 if (slash == fn)
448 break;
449 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
450 ;
451 for (ptr--; ptr >= fn; ptr--)
452 if (*ptr == '/')
453 break;
454 if (ptr < fn)
455 break;
456 slash += 3;
457 while (*slash)
458 *++ptr = *++slash;
459 }
460 }
461
462 static char *
parse_header(int peer,char * recvbuffer,size_t size,char ** filename,char ** mode)463 parse_header(int peer, char *recvbuffer, size_t size,
464 char **filename, char **mode)
465 {
466 struct formats *pf;
467 char *cp;
468 size_t i;
469
470 *mode = NULL;
471 cp = recvbuffer;
472
473 i = get_field(peer, recvbuffer, size);
474 if (i >= PATH_MAX) {
475 tftp_log(LOG_ERR, "Bad option - filename too long");
476 send_error(peer, EBADOP);
477 exit(1);
478 }
479 *filename = recvbuffer;
480 tftp_log(LOG_INFO, "Filename: '%s'", *filename);
481 cp += i;
482
483 i = get_field(peer, cp, size);
484 *mode = cp;
485
486 /* Find the file transfer mode */
487 for (; *cp; cp++)
488 if (isupper((unsigned char)*cp))
489 *cp = tolower((unsigned char)*cp);
490 for (pf = formats; pf->f_mode; pf++)
491 if (strcmp(pf->f_mode, *mode) == 0)
492 break;
493 if (pf->f_mode == NULL) {
494 tftp_log(LOG_ERR,
495 "Bad option - Unknown transfer mode (%s)", *mode);
496 send_error(peer, EBADOP);
497 exit(1);
498 }
499 tftp_log(LOG_INFO, "Mode: '%s'", *mode);
500
501 return (cp + 1);
502 }
503
504 /*
505 * WRQ - receive a file from the client
506 */
507 void
tftp_wrq(int peer,char * recvbuffer,size_t size)508 tftp_wrq(int peer, char *recvbuffer, size_t size)
509 {
510 char *cp;
511 int has_options = 0, ecode;
512 char *filename, *mode;
513 char fnbuf[PATH_MAX];
514
515 cp = parse_header(peer, recvbuffer, size, &filename, &mode);
516 size -= (cp - recvbuffer) + 1;
517
518 strlcpy(fnbuf, filename, sizeof(fnbuf));
519 reduce_path(fnbuf);
520 filename = fnbuf;
521
522 if (size > 0) {
523 if (options_rfc_enabled)
524 has_options = !parse_options(peer, cp, size);
525 else
526 tftp_log(LOG_INFO, "Options found but not enabled");
527 }
528
529 ecode = validate_access(peer, &filename, WRQ);
530 if (ecode == 0) {
531 if (has_options)
532 send_oack(peer);
533 else
534 send_ack(peer, 0);
535 }
536 if (logging) {
537 tftp_log(LOG_INFO, "%s: write request for %s: %s", peername,
538 filename, errtomsg(ecode));
539 }
540
541 if (ecode) {
542 send_error(peer, ecode);
543 exit(1);
544 }
545 tftp_recvfile(peer, mode);
546 exit(0);
547 }
548
549 /*
550 * RRQ - send a file to the client
551 */
552 void
tftp_rrq(int peer,char * recvbuffer,size_t size)553 tftp_rrq(int peer, char *recvbuffer, size_t size)
554 {
555 char *cp;
556 int has_options = 0, ecode;
557 char *filename, *mode;
558 char fnbuf[PATH_MAX];
559
560 cp = parse_header(peer, recvbuffer, size, &filename, &mode);
561 size -= (cp - recvbuffer) + 1;
562
563 strlcpy(fnbuf, filename, sizeof(fnbuf));
564 reduce_path(fnbuf);
565 filename = fnbuf;
566
567 if (size > 0) {
568 if (options_rfc_enabled)
569 has_options = !parse_options(peer, cp, size);
570 else
571 tftp_log(LOG_INFO, "Options found but not enabled");
572 }
573
574 ecode = validate_access(peer, &filename, RRQ);
575 if (ecode == 0) {
576 if (has_options) {
577 int n;
578 char lrecvbuffer[MAXPKTSIZE];
579 struct tftphdr *rp = (struct tftphdr *)lrecvbuffer;
580
581 send_oack(peer);
582 n = receive_packet(peer, lrecvbuffer, MAXPKTSIZE,
583 NULL, timeoutpacket);
584 if (n < 0) {
585 if (debug & DEBUG_SIMPLE)
586 tftp_log(LOG_DEBUG, "Aborting: %s",
587 rp_strerror(n));
588 return;
589 }
590 if (rp->th_opcode != ACK) {
591 if (debug & DEBUG_SIMPLE)
592 tftp_log(LOG_DEBUG,
593 "Expected ACK, got %s on OACK",
594 packettype(rp->th_opcode));
595 return;
596 }
597 }
598 }
599
600 if (logging)
601 tftp_log(LOG_INFO, "%s: read request for %s: %s", peername,
602 filename, errtomsg(ecode));
603
604 if (ecode) {
605 /*
606 * Avoid storms of naks to a RRQ broadcast for a relative
607 * bootfile pathname from a diskless Sun.
608 */
609 if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
610 exit(0);
611 send_error(peer, ecode);
612 exit(1);
613 }
614 tftp_xmitfile(peer, mode);
615 }
616
617 /*
618 * Find the next value for YYYYMMDD.nn when the file to be written should
619 * be unique. Due to the limitations of nn, we will fail if nn reaches 100.
620 * Besides, that is four updates per hour on a file, which is kind of
621 * execessive anyway.
622 */
623 static int
find_next_name(char * filename,int * fd)624 find_next_name(char *filename, int *fd)
625 {
626 /*
627 * GCC "knows" that we might write all of yyyymmdd plus the static
628 * elemenents in the format into into newname and thus complains
629 * unless we reduce the size. This array is still too big, but since
630 * the format is user supplied, it's not clear what a better limit
631 * value would be and this is sufficent to silence the warnings.
632 */
633 static const int suffix_len = strlen("..00");
634 char yyyymmdd[MAXPATHLEN - suffix_len];
635 char newname[MAXPATHLEN];
636 int i, ret;
637 time_t tval;
638 size_t len, namelen;
639 struct tm lt;
640
641 /* Create the YYYYMMDD part of the filename */
642 time(&tval);
643 lt = *localtime(&tval);
644 len = strftime(yyyymmdd, sizeof(yyyymmdd), newfile_format, <);
645 if (len == 0) {
646 syslog(LOG_WARNING,
647 "Filename suffix too long (%zu characters maximum)",
648 sizeof(yyyymmdd) - 1);
649 return (EACCESS);
650 }
651
652 /* Make sure the new filename is not too long */
653 namelen = strlen(filename);
654 if (namelen >= sizeof(newname) - len - suffix_len) {
655 syslog(LOG_WARNING,
656 "Filename too long (%zu characters, %zu maximum)",
657 namelen,
658 sizeof(newname) - len - suffix_len - 1);
659 return (EACCESS);
660 }
661
662 /* Find the first file which doesn't exist */
663 for (i = 0; i < 100; i++) {
664 ret = snprintf(newname, sizeof(newname), "%s.%s.%02d",
665 filename, yyyymmdd, i);
666 /*
667 * Size checked above so this can't happen, we'd use a
668 * (void) cast, but gcc intentionally ignores that if
669 * snprintf has __attribute__((warn_unused_result)).
670 */
671 if (ret < 0 || (size_t)ret >= sizeof(newname))
672 __unreachable();
673 *fd = open(newname, O_WRONLY | O_CREAT | O_EXCL, 0666);
674 if (*fd > 0)
675 return 0;
676 }
677
678 return (EEXIST);
679 }
680
681 /*
682 * Validate file access. Since we
683 * have no uid or gid, for now require
684 * file to exist and be publicly
685 * readable/writable.
686 * If we were invoked with arguments
687 * from inetd then the file must also be
688 * in one of the given directory prefixes.
689 * Note also, full path name must be
690 * given as we have no login directory.
691 */
692 int
validate_access(int peer,char ** filep,int mode)693 validate_access(int peer, char **filep, int mode)
694 {
695 static char pathname[MAXPATHLEN];
696 struct stat sb;
697 struct dirlist *dirp;
698 char *filename = *filep;
699 int err, fd;
700
701 /*
702 * Prevent tricksters from getting around the directory restrictions
703 */
704 if (strncmp(filename, "../", 3) == 0 ||
705 strstr(filename, "/../") != NULL)
706 return (EACCESS);
707
708 if (*filename == '/') {
709 /*
710 * Absolute file name: allow the request if it's in one of the
711 * approved locations.
712 */
713 for (dirp = dirs; dirp->name != NULL; dirp++) {
714 if (dirp->len == 1)
715 /* Only "/" can have len 1 */
716 break;
717 if (strncmp(filename, dirp->name, dirp->len) == 0 &&
718 filename[dirp->len] == '/')
719 break;
720 }
721 /* If directory list is empty, allow access to any file */
722 if (dirp->name == NULL && dirp != dirs)
723 return (EACCESS);
724 if (stat(filename, &sb) != 0)
725 return (errno == ENOENT ? ENOTFOUND : EACCESS);
726 if (!S_ISREG(sb.st_mode))
727 return (ENOTFOUND);
728 if (mode == RRQ) {
729 if ((sb.st_mode & S_IROTH) == 0)
730 return (EACCESS);
731 } else {
732 if (check_woth && (sb.st_mode & S_IWOTH) == 0)
733 return (EACCESS);
734 }
735 } else {
736 /*
737 * Relative file name: search the approved locations for it.
738 * If the file exists in one of the directories and isn't
739 * readable, continue looking. However, change the error code
740 * to give an indication that the file exists.
741 */
742 err = ENOTFOUND;
743 for (dirp = dirs; dirp->name != NULL; dirp++) {
744 snprintf(pathname, sizeof(pathname), "%s/%s",
745 dirp->name, filename);
746 if (stat(pathname, &sb) != 0)
747 continue;
748 if (!S_ISREG(sb.st_mode))
749 continue;
750 err = EACCESS;
751 if (mode == RRQ) {
752 if ((sb.st_mode & S_IROTH) == 0)
753 continue;
754 } else {
755 if (check_woth && (sb.st_mode & S_IWOTH) == 0)
756 continue;
757 }
758 break;
759 }
760 if (dirp->name != NULL)
761 *filep = filename = pathname;
762 else if (mode == RRQ)
763 return (err);
764 else if (err != ENOTFOUND || !create_new)
765 return (err);
766 }
767
768 /*
769 * This option is handled here because it (might) require(s) the
770 * size of the file.
771 */
772 option_tsize(peer, NULL, mode, &sb);
773
774 if (mode == RRQ) {
775 fd = open(filename, O_RDONLY);
776 } else if (create_new) {
777 if (increase_name) {
778 err = find_next_name(filename, &fd);
779 if (err > 0)
780 return (err + 100);
781 } else {
782 fd = open(filename,
783 O_WRONLY | O_TRUNC | O_CREAT,
784 S_IRUSR | S_IWUSR | S_IRGRP |
785 S_IWGRP | S_IROTH | S_IWOTH );
786 }
787 } else {
788 fd = open(filename, O_WRONLY | O_TRUNC);
789 }
790 if (fd < 0)
791 return (errno + 100);
792 file = fdopen(fd, mode == RRQ ? "r" : "w");
793 if (file == NULL) {
794 close(fd);
795 return (errno + 100);
796 }
797 return (0);
798 }
799
800 static void
tftp_xmitfile(int peer,const char * mode)801 tftp_xmitfile(int peer, const char *mode)
802 {
803 uint16_t block;
804 time_t now;
805 struct tftp_stats ts;
806
807 memset(&ts, 0, sizeof(ts));
808 now = time(NULL);
809 if (debug & DEBUG_SIMPLE)
810 tftp_log(LOG_DEBUG, "Transmitting file");
811
812 read_init(0, file, mode);
813 block = 1;
814 tftp_send(peer, &block, &ts);
815 read_close();
816 if (debug & DEBUG_SIMPLE)
817 tftp_log(LOG_INFO, "Sent %jd bytes in %jd seconds",
818 (intmax_t)ts.amount, (intmax_t)time(NULL) - now);
819 }
820
821 static void
tftp_recvfile(int peer,const char * mode)822 tftp_recvfile(int peer, const char *mode)
823 {
824 uint16_t block;
825 struct timeval now1, now2;
826 struct tftp_stats ts;
827
828 gettimeofday(&now1, NULL);
829 if (debug & DEBUG_SIMPLE)
830 tftp_log(LOG_DEBUG, "Receiving file");
831
832 write_init(0, file, mode);
833
834 block = 0;
835 tftp_receive(peer, &block, &ts, NULL, 0);
836
837 gettimeofday(&now2, NULL);
838
839 if (debug & DEBUG_SIMPLE) {
840 double f;
841 if (now1.tv_usec > now2.tv_usec) {
842 now2.tv_usec += 1000000;
843 now2.tv_sec--;
844 }
845
846 f = now2.tv_sec - now1.tv_sec +
847 (now2.tv_usec - now1.tv_usec) / 100000.0;
848 tftp_log(LOG_INFO,
849 "Download of %jd bytes in %d blocks completed after %0.1f seconds\n",
850 (intmax_t)ts.amount, block, f);
851 }
852
853 return;
854 }
855